The spoil is put into the train and taken down the tunnel and back through the shaft into trucks.

BBC: London's underground boring renaissance

But I had just gotten out of elevator and just made a right turn into a hallway going towards my office, and that is when the first plane hit, and I believe, not exactly sure, but the flames went through elevator shaft, engulfed me.

CNN: WTC burn victim: 'I feel pretty lucky'

They were pulled up through a small shaft after 69 days underground.

BBC: Chile slow search for miner trapped 100m underground

Mr Fyfield was seriously injured in the incident but escaped through an old mine shaft.

BBC: Gleision disaster: Mine manager charged over four deaths

He started with the small quatrefoil lights of the Holy Spirit and the crucifixion, proceeding down through the main panels of Christ and his followers on the mountain, with all the way the white shaft of God's transfiguring light growing broader through the fire-and-storm colours of the glass.

ECONOMIST: Michael Lassen

Leandro Erlich's "Stuck Elevator" (2011) is more complex: A freestanding box, about the size of an elevator shaft, it reveals, through an open door, the elevator's lifting mechanism and, through a gap at the bottom, the interior of the cabin, with a newspaper on the floor.

WSJ: Too Clever by Half | More Real? | Minneapolis Institute of Arts | By Peter Plagens